Is "general.useragent.extra.TBPLATFORM_NS_PH AlexaToolbar/pxabq3Gf-1.2 " a toolbar I did not ask for?

I have been invaded too often by unwanted toolbars and have managed to uninstall them so far. I noticed the above reference to AlexaToolbar after I reset Firefox. I have also tried the about:config tool to reset this entry and deleted all the history, then restarted Firefox. This process doesn't rid me of the AlexToolbar entry in the about:config tool. Is this tool a part of Firefox or can I simply delete it ??

If it is not a part of Firefox then I do want to rid myself of it !!

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